Machine for making millboard.



N0. 829,677. PATENTED AUG. 28, 1906.

W. SILLMAN.

MACHINE FOR MAKING MILLBOARDS. APPLIGATION IIVLED APR.11,1906.

34) Mob UNITED STATES WILLIAM SILLMAN.

OFNEW YORK, N. Y.

MACHINE FOR MAKING MILLBOARD.

Specification of Letters Patent.

Patented Aug. 28, 1906.

' Application filed April 11. 1906. Serial No. 311,077-

To all whom it may concern:

Be it known that I, WILLIAM SILLMAN, a citizen of the United States of America, and a resident of the borough of Brooklyn, county of Kings, city and State of New York, have invented certain new and useful Improvements in Machines for Making Millboard, of which the following is a specification.

My. invention relates generally to the manufacture of plates, sheets, or boards out of pulp-like mixtures, and more specifically consists of im roved mechanism for economically han ling mixtures containing ingredients of great fineness of pulverization and considerable specific gravity.

Heretofore it has been customary to employ ap aratus of the general paper-making or cardboard-making machine type known in the art as wet machines for the urpose of making millboard and heavier p ates or sheets out of various pulped fibrous materials including short asbestos fibers mixed with various pulverized materials as fillers and as active constitutents in the composition. When a material which is finely pulverized, such as hydraulic cement, and which has considerable specific gravity is employed in large quantity in such manufacture, the same is wasted in large part by being drawn through the meshes of the Wire-cloth-covered roll upon which the pulp material is ori inally deposited by the action of suction and so carried away and also by being deposited in the bottom of the tank of the wet machine by virtue of its greater specific gravity. My invention overcomes this feature of waste by ractically compelling all of the heavier and ely-divided constituent of the mixture to enter into the finished product, and has other advantages and economies to be hereinafter pointed out.

One form of apparatus embodying my invention is illustrated in the accompanying sheet of drawings, in which- Figure 1 is a side elevation of the machine, and Fig. 2 is a detail plan view of the mixingbox and connections and spreading-roller.

' Throughout the drawings like referencefigures indicate like parts.

1 1 represent arts of the main frame of the machine, an 2 is an endless band of felt runnin over a series of guide-rollers 3 3, &c. '17 is a cater for cleanin said felt; 4, an adjusting-roll for guiding t e felt in proper relation to the beater, the position of. which iscontrolled by the adjustin -lever 18.

23 23, &c., are suction boxes of any convenient form over which the felt 2 passes. The suction may be produced by steam-jets, blowers, or in any convenient manner. (Not here illustrated.) The felt 2 is properly guided with reference to these suction-boxes by the adjustable roll 5, the position of which is controlled by the screw 21, operated by the hand-wheel shaft 22. 6 5

6 is a tightening-roll for the endless band of felt, the position of which is controlled by the screw 19 and the handwheel 20.

7 is a lower press-roll mounted in stationary journal-bearings 8, and 9 the wiper 7o press-roll mounted in movable journal-bearings 10, carried by the lever 13, pivoted to the main frame at 14 and pulled downward by the link 15, which is connected to the weighted pressure-lever 16.

11 is a screw for limitin the downward motion of the upper press-r0 l 9 by means of the adjustable hand-wheel nut 12. The endless felt of course passes between the pressrolls, as shown.

37. is the lower drying-roll for the felt, mounted in stationary journal-bearings 38, and 39 is the upper drying-roll mounted in journal-bearings 40 in the lever 42, ivoted to the main frame at 43 and presse down- 85 ward by the adjustable Weight 44.

24 is the mixing-box, to which the stock or material, such as asbestos fiber and Portland cement beaten up with a sufficient quantity of water, is delivered through the stock-pipe 25. 9o

26 is a water-pipe through which a suitaable quantity of water is delivered.

46 is a passage leading from the mixingbox to the distributing-trough 47. This passage is controlled by a gate 48. The trough 5 47 has a curved bottom, as shown in dotted lines.

27 is an agitator of any convenient form, located in the distributing-trough. As shown, it consists of a horizontal shaft with a series mo of beater-arms, the shaft being rotated by a power -belt 41 or any other convenient means. The side of the distributing-trough, which is next the agitator, has a horizontal delivery-slot 28 formed therein at a height :05 approximately corresponding to the axis of the agitator 27. 29 is an adjustable gate for said slot.

is an inclined apron of oil-cloth or simi lar material extending from the edge of the distributing-trou h below the slot 28 down to a oint over t e upper strand of the" endless elt 2. This apron has upturned sides 31 31. I

32 is a re lating-roll havin -aface. ,f1;ubber or simiii r suitable maten iil mounted, he journal-bearings, which can be adjusted toward or away from the felt b means of theadjustingrscrew 33 This rol may co6per-' ate with the felt 201'. with the apron 30 or with both at their juncture. It is rotated by the belt 34- in the direction to produce, circumferential travel on its under side opposite to the travel of'the felt at the point'of contact therewith or opposite to the direcof thefe tion of flow of the material down t e apron 30.

35 is anoverfiow-pipe from t e mixingtank, and 36 a partit1on which permits any excess of material to flow over into the comartment 45, which serves as an overflowand which is drained by the overflowpipe 35..

vThe operation of my invention is as follows: The guide-roller system and the endless bando felt 2, carried thereby, being set in motion by means of power, (not shown,) and the supply of pulp-stock, cement, and Water being'turned onto the mixing-box, the same will overflow through the slot 28 in an even stream down the inclined apron 30 to the upper strand of the endless felt 2, upon which t will be deposited in a thin even layer or film by means of the action of the regulating-roll 32 and the travelin motion t compound layer 0 cement and pulp is thusformed on the felt 2, and as this passes over the suction-boxes 23 23, &c.,,

a considerable uantity offthe Water or other liquid is sucked down through the felt, and the layer o f'material on the felt is left in a sufficiently dr condition to adhere to the upper press-r0 l 9 as the felt passesthrough said press-rolls. his press-roll is usually made ofiron. A film of material is therefore woundupon theu per press-roll 9, the same rising as the thic I 'ess of the winding on its surface increases, until a redetermined thickness is attained, when t e cylindrical covering thus formed is slit longitudinall of the cylinder by a knife in the hands of the operator and=removed in the shape of a plate or sheet whose length is the length of the cylinder andwhose width is the circumferenc'e thereof: The felt from which the major portion of the material-has thus been removed passes ondown aroundthe guiderolls, 4 and up b the beater 17, which knocks out of the elt the smallquantity of material-remaining therein. The felt then passes between the drying-rolls 37 38 ,Which squeeze the moisture out of it, and thence around the tightening -roll 6 back to the neighborhood of the mixing-tank, where it gein has deposited upon it the film of materia The advantages of my invention comprise the practicall complete saving of all waste of material, t ere being no opportunity for may of the cement or other substance to escape de osition upon the felt -2, the pro- :longed ife' of the felt itself which is not forced into destructive contact with the wire-cloth used in former machines, and the ossibility of cleaning" and drying the elt, &c.-

It is evident, of course, that various changes "could be made in the relative arrangement and form of the i parts of my invention without departing om the spirit and scope thereof, so long as the general principle of operation above'set forth be adhered to.

Having, therefore, described my invention, I claim 1 In a machine for making millboard and similar substances, the combination of a pair of (firess-rolls, a series of suction-boxes, an en ess band of felt passing over said suctionboxes and through said rolls and means for initially depositing'a dilute mixture of pulped fiber and cement on the upper section of said endless felt.

2. In a machine for making millboard and similar substances, the combination of a pair of (-ipressrolls, a series of suction-boxes, an en less band of felt passing over said suction-boxes and through said rolls and means for initially depositing thematerials to be employed on the upper section of said endless felt, said meanscomprising adistribut ving-trough, means for so plying a dilute mixture of (pu'lped fiber an cement thereto,

a graduate sluiceway therein, approximating in length the width of the felt, and a conveyer'from said sluiceway to the upper section of the endless felt.

3. In a machine for making millboardand similar substances, the combmationofa pair ofpress-rolls, a series of guide-rolls, an end;- less band of felt passing over said guide-rolls and through said press-rolls and means for initially depositing a dilute mixture of pulped fiber and cement on the upper, section of said endless felt, said means comprising a distributing-trough, a graduated sluiceway therein, an agitator in the trough located adjacent to the sluiceway, and an apron extending from the sluiceway to the upper section of the endless felt.

4. In a machine for making millboard and similar substances, the combination of a pair of press-rolls, a series of guide-rolls, an-endthe sluiceway, and an apron extending from the sluiceway to the upper section of the endless felt, said a ron aving upturned sides spaced apart a istance equal to the width of t e millboard to be formed.

5. In a machine for making millboard and similar substances, the combination of a pair of press-rolls, a series of guide-rolls, an end less band of felt passing over said guide-rolls, and through said press-rolls, and means for initially depositing a dilute mixture of pulped fiber and cement on the upper section of said endless felt, together with a distributing-roll located over the felt near the point where the material is delivered to it.

6. In a machine for making millboard and similar substances, the combination of a pair of press-rolls, a series of guide-rolls, an endless band of felt passing over said guide-rolls and through said press rolls and means for initiallylde ositing a dilute mixture of pulped fiber and ller on the u per section of said endless felt, together with a distributing-roll located over the felt near the point where the material is delivered to it, said roll revolving in a direction to produce circumferential travel on its under slde opposite to the travel of the felt at the point of contact therewith.

7. In a machine for making millboard and similar substances, the combination of an endless ,traveling belt, a distributing-trough having a semicircular bottom cross-section, an agitator-reel journaled in said trough concentrically with said semicircular cross-section, an opening in the side of the trough parallel to the axis of the reel and in about the same horizontal plane, means for conducting the overflow from said opening to the end less belt, means for rotating the reel and means for supplying stock to the distributingtrough at a constant and uniform rate.

Signed at Brooklyn, New York, this 7th day of April, 1906.

WILLIAM SILLMAN. 

